Having fun trying to determine engine troubles - JeepForum.com

 
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post #1 of 7 Old 01-27-2014, 08:42 PM Thread Starter
OneChopOnePill
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1995 ZJ 
 
Join Date: Jan 2014
Location: Cape Cod
Posts: 13
Having fun trying to determine engine troubles

Before I start with my problem, I will say I went looked through the FAQ and found the engine trouble list. It was informative and I think I might have found the solution to my problem.

First off, my Jeep has had starting and stalling issues. Sometimes it just refuses to start. It'll try to turn over and with a bit of pressure on the gas it will run, but won't catch. When I'm moving around in my driveway, it can end up stalling out. The idle is always low when this happens. The thing rattles quite a bit sometimes, but not always. It has good days and bad days, to say the least.

At first, I thought electrical. I checked the grounds and fuses. They were good. The terminals had some corrosion so I cleaned them until they looked brand new. Nothing changed, except for the fact my fog lights started magically working again. So I ruled out electrical.

Next, I looked at the idle itself. I cleaned the IAC. Same issues. I sent it to the mechanic and he adjusted the idle. It turned on stronger. Well... it ran stronger. And the idle was nice for a whole day. But then it dropped back down to where it was before.

My ZJ started to sound louder. The exhaust started to get a rich fuel smell to it. I revved my engine up while in park a bit, and then it sounded like I was running a gutted out muffler. And then I remembered.. the muffler and catalytic converter are all OEM. They have not been changed since the day it rolled off of the factory.

So, my guess is that I need a new muffler and I may have a blown catalytic converter. I'm not sure if this is the fix, but I'm hoping it is. Regardless, I'm going to get a Flowmaster Series 40 muffler sometime this February. I plan on cutting the old muffler open to see if I had the right idea or not. If not, oh well, I'll have a new muffler.

TL;DR: After sleuthing around, I think my exhaust system is to blame for my engine problems, and if not I'll at least have a new muffler.


Optimism: If something on your Jeep breaks, replace it with something better.
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post #2 of 7 Old 01-27-2014, 08:47 PM
Gearhead31
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1995 ZJ 
 
Join Date: Feb 2012
Location: St Pete
Posts: 2,193
LOL your signature is my motto with mine..

.. A bad cat could explain the problem.

Welcome to the forum mate! Best of luck in getting that solved. I'm on my 3rd cat and 4th muffler so I have no clue how horrid the originals could end up performing this late but that would be a good place to start investing money. Worst case, it exhales a LOT better. best case, it solves your problem

1995 ZJ ltd, 4.0 i6, *cough stock cough* 253,xxx and still pumping strong
1998 Chevy Cheyenne K1500, 5.7L Vortec, mostly stock
*In peace, sons bury their fathers. In war, fathers bury their sons. - Herodotus
Quote:
Originally Posted by JasonStebbins
We can call it the Whoosh King Catalog System. :D
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post #3 of 7 Old 01-27-2014, 08:53 PM
MurdaJs
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1996 ZJ 
 
Join Date: Aug 2009
Location: Tustin
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I dont think this thread is in the FAQ, but it should be.

http://www.jeepforum.com/forum/f13/1...talls-1407423/
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post #4 of 7 Old 01-27-2014, 08:56 PM
ZeeJay1997
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Quote:
Originally Posted by MurdaJs View Post
I dont think this thread is in the FAQ,
it's in there
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post #5 of 7 Old 01-27-2014, 09:00 PM
nnovickzj
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1997 ZJ 
 
Join Date: Oct 2013
Location: wareham
Posts: 128
sometimes the Iac is bad and cleaning it doesn't fix the problem. does it ever act up when driving around town or on the highway ? also could be a leaking exhaust manifold that is throwing off the air to fuel mixture.

i see your a mass hole too if you ever need any help working on yours im happy to help out fellow mass jeepers

97 zj 5.2 40,000mi
locked front and rear, 242, 3.5 iro lift, 32x11.5 kenda klever, 28 laredos for the road
4x 130 watt 6" spots on the roof rack, h3 leds in stock fogs, 2 40w leds on the grill
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post #6 of 7 Old 01-27-2014, 09:02 PM Thread Starter
OneChopOnePill
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1995 ZJ 
 
Join Date: Jan 2014
Location: Cape Cod
Posts: 13
If it isn't I'll just have to keep going down the list, or save up the money for the mechanics. The owner before my old man bought the Jeep for my family didn't take care of it, so we've done a lot. I forgot to add the engine "blew" (didn't run a while, but then magically started up one day but was louder than a jet taking off), so we had it rebuilt with another 5.2. This Jeep was also in an accident, which wasn't disclosed when we bought it. In short, this Jeep has seen some things. I'm having fun playing with it and learning how to fix things.

And thank you!

Optimism: If something on your Jeep breaks, replace it with something better.
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post #7 of 7 Old 01-27-2014, 09:04 PM Thread Starter
OneChopOnePill
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1995 ZJ 
 
Join Date: Jan 2014
Location: Cape Cod
Posts: 13
Quote:
Originally Posted by nnovickzj View Post
sometimes the Iac is bad and cleaning it doesn't fix the problem. does it ever act up when driving around town or on the highway ? also could be a leaking exhaust manifold that is throwing off the air to fuel mixture.

i see your a mass hole too if you ever need any help working on yours im happy to help out fellow mass jeepers
We live in the same town, too.

Optimism: If something on your Jeep breaks, replace it with something better.

Last edited by OneChopOnePill; 01-27-2014 at 09:23 PM.
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